表面碳势为1.1%C的渗碳硬化层内，临近外表面部位的枣核马氏体中会出现显微裂纹。

When carburized under high carbon potential (1. 1% C), microcracks tend to appear on the martensitic matrix near the outer surface of the layer.

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通过对氮化和表面渗碳硬化齿轮大量的试验研究，设法揭示对齿轮进行氮化处理的可能性和局限性。

By means of extensive tests on nitrided and case hardened gears, it was attempted to discover the possibilities and the limits of nitriding for gears.

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周期：产品在炉中某特定温度下渗碳或硬化所需要的时间。

CYCLE time: Amount of time product spends in a furnace at specified temperature for the purpose of carburizing or hardening product.

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